Enhance Your Penis in the Shower

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The penis is not a perfect cylinder, and that calculator is assuming it is as it's just using pi*r^2. The penis consists of three mostly oval shaped cylinders, which is why girth measured around the circumference will always be different than girth when only taking in width, depth, or width and depth into consideration.
Width on it's own is useless. You could have a 50mm wide penis and very easily be below 5" EG, and someone with a 40mm wide penis could very easily be over 5.5"EG.

Width is absolutely useless on it's own. In a perfect world it would batter, but sex would probably be less joyful for a woman with a perfectly smooth cylinder going in and out unless it has vibration functions, which our penises don't have.

I think the calculator just divides your circumference by Pi as if your dick's girth was a perfect circle which obviously it isn't for you and for any other guys around here. I don't think you're over the average for diameter compared to circumference, but the simple question of if being wider is better than being larger, I'm not sure.